[Bug driver/17001] New: Linker option -Wl,foo,bar causes the driver to behave unintuitively for no input files

["rmathew at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

The GCC driver allows linker options to be passed using the "-Wl," flag.

However, the way it is implemented results in an unintuitive behaviour 
when no input files are present - the normal "no input files" message
is suppressed and the linker is invoked directly causing a link failure.
(I am seeing this behaviour in a few 3.x releases and not just the
3.5 mainline.)

As I understand it (from a reading of the manual), these options
are passed to the linker *when* it is invoked - when I specify no 
input files, the linker should *not* be invoked.

Witness:
----------------------------------- 8< -----------------------------------
    ~ > $MYGCJ
    gcj: no input files

    ~ > $MYGCJ -Wl,-rpath,/usr/local/lib
    /usr/lib/crt1.o(.text+0x18): In function `_start':
    : undefined reference to `main'
    collect2: ld returned 1 exit status
----------------------------------- 8< -----------------------------------

"Business Case":
----------------
I just build the mainline GCC without installing it.
To use, say, GCJ in such a situation, I define an alias like:

alias mygcj="$BUILD/gcc/gcj -B$BUILD/gcc/
-B/home/ranmath/src/gcc/build/i686-pc-linux-gnu/libjava/
-I$BUILD/i686-pc-linux-gnu/libjava/libgcj-3.5.0.jar
-L$BUILD/i686-pc-linux-gnu/libjava/.libs"

(where $BUILD is the folder where I built GCC)

So I can compile a normal Java program like:

  mygcj --main=Hello Hello.java

However, the resulting binary needs the libgcj.so from
the build folder, so I can either use LD_LIBRARY_PATH
or use -rpath on the command line.

To save myself the trouble, I wanted to put:

  -Wl,-rpath,$BUILD/i686-pc-linux-gnu/libjava/.libs

also in the above command line, but it causes the
compiler to behave weirdly (as noted above) when I
just say:

  mygcj

The same problem is also present for a similarly 
defined alias for g++ (of course, since the driver
is the same).

-- 
           Summary: Linker option -Wl,foo,bar causes the driver to behave
                    unintuitively for no input files
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: driver
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rmathew at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17001